Improvement in ships  forts



C. E; MARSHALL.

` Ships Port. No. 104,474. Pamed lune 2h 13.70i

I ILPETS, PHDTO-LITHOGRAPMER. WASHINGTON D, C,

i C To whom timmy concern:

l@ stent @imita CHARLES E. MARSHALL, OF CHICAGO, ILLINOIS.

i. Laim Parent No. 104,474, cared Jan@ 21,1870.

1 zMPaoveMnNr :N SHIPS' roars.

x p The Schedule referred to 1n these Letters Patent and making part of the same.

Be it 4known that I, CHARLES MARSHALL, of

Chicago, in thecount'y of Oook and State of Illinois,

i g lhave invented a new and useful vImprovement in u ,i VShips Ports and I do declarethat the' following is i a true and accurate description thereof, referencebeing i had tothe accompanying drawing and to the letters of reference marked thereon andfbeing a part of t-his 1 1l specification;

.Figure 1 is a vertical sectionotl a ships port with i my'invention attached `and open.

" Figure 2 is anvcrtical section'ot' the same, showing thesameclosed l :Figure 3 isa vertical section `of a ships port closed,

i witha modification of my invention.'

"Figure 4 is a horizontal section of a shipsport closed, showing same modification.` Figure 5 is a section of covering plate, ot' metal, j,

used in igs. 3 and 4. i f

Like letters refer to like parts in each'figure The nature of this invention relates to an improvement in ships ports, and consists in an arrangement i rof packing interposed between metal'plates, .with `wood'backing fitted to the'port-hole. so closely and perfectlyl as to be water tight, and to exclude the' water more eft'ectuall)`T thancanbe done by anycalk- .i ing process whatever.rv y

In=thedrawing j v Airepresents the port-hole of the. vessel open in B, the hull of the vessel; BQ `a tongue, runningaround the port-hole, against which the portsA shut. y

a, the wood backing of the ports. 11,* sheets of `rubber or suitable packing material. c c, metal plates.

d, bolts in the outer port, which, when the .ports i. are closed, pass through the inner` port through holes i e, and are fastened down tightly by the nuts jl. These ports may be hung on hinges tothe side, top, or bot# As it is frequently necessary that apoithole should be `closed in sections instead of` all at oncethis invention may be modified with that purpose in view, as is shown in gs. 3 and 4 of the drawing. In this, a metal frame, h, fitting the port-hole, is used..

Between this and the tongue B. is placed packing, of rubber or other material, h'.

This frame is constructed with as many openings, j, as aredesired, in the drawing three, and to these openings are tted plates of metal, j', each with wood backing, 7c, overlapping the openings in the frame.v

Between these plates and the backing are interposed sheets of packing, b. Y

These sections overlap the openings, so that, when all are arranged, they completely cover the frame and form water-tight joints with each other. Each of these sections is provided -with screwbolts, d, which pass through nuts, m, on the inside of the frames, which bear on braces, a, lying on `the inside ot' the frame across the openings. By screwing down these nuts, the sections are rmly fastened to the frame and, all together, form a single port, and can be so-used.

. The bolts project further through bars, o, crossing the port-hole on the inside, and so projectingv .beyond itas to act as braces, against which bear the'nuts m, bywhich the port is exactly tted to the port-hole, 'the packing being expanded so as to exclude thewat'er effectually. y A

The advantages of this port are, that it can be made perfectly water tight and secure against leakage; that, if', by straining of the vessel, the port is sprung, it is easily and eii'ectually drawn together, so as to be as forth.- Y

CHARLES E. MARSHALL. Witnesses:

SAMUEL B. BELL,

GEO. 0.` MANCHESTER. 

